256625511 has 4 divisors (see below), whose sum is σ = 342167352. Its totient is φ = 171083672.

The previous prime is 256625507. The next prime is 256625521. The reversal of 256625511 is 115526652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256625511 - 2² = 256625507 is a prime.

It is a super-2 number, since 2×256625511² = 131713305792022242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256625521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42770916 + ... + 42770921.

It is an arithmetic number, because the mean of its divisors is an integer number (85541838).

Almost surely, 2^256625511 is an apocalyptic number.

256625511 is a deficient number, since it is larger than the sum of its proper divisors (85541841).

256625511 is an equidigital number, since it uses as much as digits as its factorization.

256625511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85541840.

The product of its digits is 18000, while the sum is 33.

The square root of 256625511 is about 16019.5352928854. The cubic root of 256625511 is about 635.4771547460.

The spelling of 256625511 in words is "two hundred fifty-six million, six hundred twenty-five thousand, five hundred eleven".